IOcean Mainport Holdings was
formed in about 2005 as a joint venture between Irish
Mainport Holdings and Sartor Shipping of Norway. In 2007
they bought the Havila standby fleet and over time
acquired other vessels, and ordered vessels. Sartor Shipping
acquired the interest of Irish Mainport Holdings in
Ocean Mainport in late 2008. Thereafter Irish Mainport
has concentrated on supporting the seismic
business, which for those who don't know, now
requires support vessels so that the ships
towing the cables do not have to stop their
work. The support vessels also act as guard
ships to keep commercial ships away from the
cables.

Since we don't have a precise category for
seismic support ships they are included as
anchor handlers. That's what most of them used
to be. They also own one seismic chase boat
which is smaller than the minimum size for
inclusion in this record.